butt-huggers vs tighties

butt-huggers

noun

  • Men's briefs; underwear. 

  • Skin-tight shorts. 

tighties

noun

  • Men's or boys' briefs. 

  • Form-fitting cycling shorts. 

How often have the words butt-huggers and tighties occurred in a corpus of books? (source: Google Ngram Viewer )